NX Nastran DMAP Programmer's Guide - Kxcad.net

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NLITER
Computes nonlinear analysis solution matrices and tables
IEXT Input-integer-default=0. Extraction level for reduced incomplete
Coolest factorization. See the “SOLVIT” on page 1412 module
description.
ADPCON Input-real-default=0.0. Contact penalty value. Scale factor for
adjusting penalty values on restart. Update penalty values if
positive.
PBCONT Input-integer-default=0. Slideline contact flag.
NBCONT Output-integer-default=0. Number of bisections due to slideline
contact.
GPFORCE Input-integer-default=-1. The number of columns in FENL. If
GPFORCE less than or equal to zero then no GPFORCE or ESE
command is present.
Remarks:
1. NLITER updates the displacement vector for as many iterations as are necessary
to attain an equilibrium between the applied loads and the forces. NLITER
calculates nonlinear forces and follower forces which are used to obtain new
displacements until a converged solution is found, or a new stiffness matrix is
necessary, or a bisection of the load step is necessary.
2. KGGNL is needed for the reduced incomplete Cholesky factorization in the
iterative solver only. Otherwise it may be purged.
3. MGG, RDEST, RECM are only required for heat transfer analysis. Otherwise they
may be purged.
4. ULLT is required only for unsymmetric stiffness. Otherwise it may be purged.
5. TABS is required for creep analysis.
6. KFLAG is further explained below:
-1 Solution had converged, but no stiffness update had been made or
solution had not converged, and a stiffness matrix update had been
made. A new stiffness matrix is required before starting bisection.
1 Solution had converged and a stiffness update had been made. No new
stiffness matrix is required before starting bisection.